testing web page points to possibly obsolete information for 4.0.0

[Benson Margulies]

https://karaf.apache.org/manual/latest/developers-guide/writing-tests.html

This talks about

org.apache.karaf.tooling.exam:org.apache.karaf.tooling.exam.container

which has not been released since a 3.0.0 RC. Are the coordinates wrong?